GeezerVisonThe World Wide Web, restored to 800 pixels of glory. |
| Home|About|Gaming cabinet|Archives|How it works|Starter sites |
GeezerVison is showing github.com — STLSourceCodeNote/2_STL_allocator/2_2_3_stl_construct.h at master · naccept/STLSourceCodeNote Expand file tree/ Copy path2_2_3_stl_construct.hMore file actions 135 lines (108 loc) · 4.03 KB / Copy path2_2_3_stl_construct.hFile metadata and controls135 lines (108 loc) · 4.03 KB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 /* * * Copyright (c) 1994 * Hewlett-Packard Company * * Permission to use, copy, modify, distribute and sell this software * and its documentation for any purpose is hereby granted without fee, * provided that the above copyright notice appear in all copies and * that both that copyright notice and this permission notice appear * in supporting documentation. Hewlett-Packard Company makes no * representations about the suitability of this software for any * purpose. It is provided "as is" without express or implied warranty. * * * Copyright (c) 1996,1997 * Silicon Graphics Computer Systems, Inc. * * Permission to use, copy, modify, distribute and sell this software * and its documentation for any purpose is hereby granted without fee, * provided that the above copyright notice appear in all copies and * that both that copyright notice and this permission notice appear * in supporting documentation. Silicon Graphics makes no * representations about the suitability of this software for any * purpose. It is provided "as is" without express or implied warranty. */ /* NOTE: This is an internal header file, included by other STL headers. * You should not attempt to use it directly. */ #ifndef __SGI_STL_INTERNAL_CONSTRUCT_H #define __SGI_STL_INTERNAL_CONSTRUCT_H #include <new.h> // 使用placement new __STL_BEGIN_NAMESPACE // construct and destroy. These functions are not part of the C++ standard, // and are provided for backward compatibility with the HP STL. We also // provide internal names _Construct and _Destroy that can be used within // the library, so that standard-conforming pieces don't have to rely on // non-standard extensions. // Internal names template <class _T1, class _T2> inline void _Construct(_T1* __p, const _T2& __value) { new ((void*) __p) _T1(__value); // placement new; 唤起T1::T1(value) } template <class _T1> inline void _Construct(_T1* __p) { new ((void*) __p) _T1(); } // 第一个版本，接受一个参数 template <class _Tp> inline void _Destroy(_Tp* __pointer) { __pointer->~_Tp(); // 调用dtor ~T() } // 如果元素value type 有 non-trivial destructor template <class _ForwardIterator> void __destroy_aux(_ForwardIterator __first, _ForwardIterator __last, __false_type) { for ( ; __first != __last; ++__first) destroy(&*__first); } // 如果元素value type 有 trivial destructor template <class _ForwardIterator> inline void __destroy_aux(_ForwardIterator, _ForwardIterator, __true_type) {} // 判断元素value type是否有trivial destructor template <class _ForwardIterator, class _Tp> inline void __destroy(_ForwardIterator __first, _ForwardIterator __last, _Tp*) { typedef typename __type_traits<_Tp>::has_trivial_destructor _Trivial_destructor; __destroy_aux(__first, __last, _Trivial_destructor()); } // 第二个版本，接受两个迭代器，函数设法找出元素类别，进而利用 __type_traits<>使用最佳措施 template <class _ForwardIterator> inline void _Destroy(_ForwardIterator __first, _ForwardIterator __last) { __destroy(__first, __last, __VALUE_TYPE(__first)); } // destroy()特化版 inline void _Destroy(char*, char*) {} inline void _Destroy(int*, int*) {} inline void _Destroy(long*, long*) {} inline void _Destroy(float*, float*) {} inline void _Destroy(double*, double*) {} #ifdef __STL_HAS_WCHAR_T inline void _Destroy(wchar_t*, wchar_t*) {} #endif /* __STL_HAS_WCHAR_T */ // -------------------------------------------------- // Old names from the HP STL. template <class _T1, class _T2> inline void construct(_T1* __p, const _T2& __value) { _Construct(__p, __value); } template <class _T1> inline void construct(_T1* __p) { _Construct(__p); } template <class _Tp> inline void destroy(_Tp* __pointer) { _Destroy(__pointer); } template <class _ForwardIterator> inline void destroy(_ForwardIterator __first, _ForwardIterator __last) { _Destroy(__first, __last); } __STL_END_NAMESPACE #endif /* __SGI_STL_INTERNAL_CONSTRUCT_H */ // Local Variables: // mode:C++ // End: |
| You are visitor 01402520 — GeezerVison does not store the pages you look up. Best viewed with Netscape Navigator 4.7 or Internet Explorer 6 at 800×600. No cookies required. |